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Royal Society of Chemistry, Dalton Transactions, 9(43), p. 3462, 2014

DOI: 10.1039/c3dt52839a

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Solvent-regulated assemblies of 1D lanthanide coordination polymers with the tricarboxylate ligand

This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Solvothermal reactions of the tricarboxylic acid ligand, biphenyl-3,3', 5-tricarboxylic acid (H(3)bpta), and rare earth nitrate (Ln(NO3)(3) center dot 6H(2)O)in the presence of KOH or DMF produced eight 1D linear coordination polymers, namely, [La(bpta)(H2O)(5)center dot(H2O)(3)](n) (1), [Pr(bpta)(H2O)(5)center dot(H2O)(2.5)](n) (2), [Nd(bpta)(H2O)(5)center dot(H2O)(1.75)] n (3), [Sm(bpta)(H2O)(5)center dot(H2O)(0.5)](n) (4)and [Ln(bpta)(DMF)(H2O)(3)center dot(H2O)] n [Ln = Eu (5), Gd (6), Tb (7), Dy (8)]. The 1D chain further assembles into a 3D supramolecular network structure through hydrogen bonds and p-p stacking among chains. Complexes 3-5 and 7 display the typical emission spectra for lanthanide-centred luminescence. The optical properties of 5 were analysed in detail and coincide well with the structural properties. The influence of temperature on the luminescence lifetime of 6 has been studied and different non-radiative decay paths have been discussed. The magnetic properties show that 4 and 5 exhibit strong spin-orbit coupling, while weak antiferromagnetic coupling exists in 6.